PerspCamera vs Probability
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PerspCamera
This utility app assists in creating perspective drawings by using device tilt to calculate perspective lines. It allows users to draw horizontal lines, vanishing points, grids, and cubes based on calculated perspective. Users can set the device's tilt by placing it on a sloped surface and tapping a button.
- Perspective calculation from device tilt
- Draw horizontal lines
- Vanishing points
- Grid generation
- Arbitrary cube drawing
- Set tilt via device placement
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This app records the perspective calculated from the iPhone's tilt angle at the time of shooting directly onto the photo. In the current version, you can draw horizontal lines, vertical lines, 45° lines, as well as grids, cubes, and rectangular solids. When you want to find the perspective of a slope, just place your iPhone on the inclined surface and press the SetTilt button! You can choose from two saving methods: drawing the perspective overlay on the photo and saving it as one image, or saving the photo and perspective as separate images. * Before use, you need to configure the angle of view using an actual horizon line.
Probability
Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.
- Probability assessment
- Decision-making improvement
- Problem-solving formulas
- Personalized notes
- Dice and coin toss simulations
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Probability is the key to making decisions under uncertainty, and with our app, you can improve your ability to assess probabilities and make better decisions in life. Our app includes different formulas to help you solve problems and make decisions, as well as the option to take references and write down your own notes about probability. Plus, you can have fun with probability by tossing dice and coins.
Screenshots
Verdict
The clearest difference is price: Probability at Free against PerspCamera's $9.99. Probability also leads on update cadence (every 10 days vs every 3 months). PerspCamera's advantage is in-app purchases (none vs 1) and review sentiment (20% vs 0%). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Probability is free to download; PerspCamera costs $9.99 up front. Probability sells 1 one-off in-app purchase. PerspCamera asks for nothing beyond the download.
PerspCamera ships an update every 3 months, Probability every 10 days. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.
| Parameter | PerspCamera | Probability |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | 20.0% of reviews — better | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 166 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomohiro Yamashita | Man Hung Sun |
Customer experience
PerspCamera
Probability
In-app purchases
PerspCamera
No in-app purchases
Probability
- Upgrade$0.99
Questions
Is PerspCamera free?
Is Probability free?
Do PerspCamera or Probability have ads?
Which is updated more often, PerspCamera or Probability?
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